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Journal of Self-Assembly and Molecular Electronics

Editors-in-Chief:
Baoquan Ding, National Center for Nanoscience and Technology, China
Peter Fojan, Aalborg University, Denmark
Leonid Gurevich, Aalborg University, Denmark


ISSN: 2245-4551 (Print Version),

ISSN: 2245-8824 (Online Version)
Vol: 7   Issue: Continuous Article Publication

Published In:   2019

Publication Frequency: Continuous Article Publication


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The Effect of 2D Van der Waals Materials on the Photoresponse of Upconversion Nanoparticles

doi: https://doi.org/10.13052/jsame2245-4551.7.004
Hangshuai Jin1, Zhimin Zhang1, Zhefei Zhang2, Pit On Chim2, Lei Liu1 and Mingdong Dong2

1Institute for Advanced Materials, Jiangsu University, China
2Interdisciplinary Nanoscience Center (iNANO), Aarhus University, 8000 Aarhus C, Denmark

Abstract: [+]    |    Download File [ 2053KB ]    |   Read Article Online    |   Supplementary Information

Abstract: Upconversion materials, a type of novel functional materials, have many good physicochemical properties, such as high luminescence stability, high chemical stability, long luminous life, and low potential biotoxicity. How to regulate the luminescence of upconversion materials is a significant challenge. Two-dimensional (2D) Van der Waals materials are a new type of nanomaterials with a layer structure. Some of them are capable of quenching the luminescence of dyes, which could be applied in the modulation of optical response of upconversion materials. Therefore, in this work, we explored the photoresponse of -NaYF4:Yb/Er triggered by 2D Van der Waals materials including graphene oxide, MoS2, g-C3N4 and BN. The results obtained in this work would be beneficial for the further application of luminescence modulation of UCNPs. Using UCNPs as a potential fingerprint of 2D Van der Waals materials, their optical response might be used to distinguish the 2D Van der Waals materials.

Keywords: Optical response, β-NaYF4:Yb/Er, GO, g-C3N4, MoS2, BN.

Molecular Simulations have Boosted Knowledge of CRISPR/Cas9: A Review

doi: https://doi.org/10.13052/jsame2245-4551.7.003
Angana Ray1 and Rosa Di Felice1,2,3

1Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA
2 Department of Biological Sciences, Quantitative and Computational Biology Sector, University of Southern California, Los Angeles, CA 90089, USA
3 CNR Institute of Nanosciences, Via Campi 213/A, 41125 Modena, Italy

Abstract: [+]    |    Download File [ 612KB ]    |   Read Article Online

Abstract: Genome editing allows scientists to change an organism’s DNA. One promising genome editing protocol, already validated in living organisms, is based on clustered regularly interspaced short palindromic repeats (CRISPR)/Cas protein-nucleic acid complexes. When the CRISPR/Cas approach was first demonstrated in 2012, its advantages with respect to previously available techniques, such as zinc-finger nucleases (ZFNs) and transcription activatorlike effector nucleases (TALENs), immediately got attention and the method has seen a surge of experimental and computational investigations since then. However, the molecular mechanisms involved in target DNArecognition and cleavage are still not completely resolved and need further attention. The large size and complex nature of CRISPR/Cas9 complexes has been a challenge for computational studies, but some seed results exist and are illuminating on the cleavage activity. In this short review, we present recent progress in studying CRISPR/Cas9 systems by molecular dynamics simulations with coarse-grained and atomistic descriptions, including enhanced sampling.

Keywords: CRISPR/Cas9, genome editing, computer simulations, molecular dynamics, structure-function relationship.

Functional Phospholipid Nano-Microfibers and Nano-Microparticles by Electrohydrodynamic Processing: A Review

doi: https://doi.org/10.13052/jsame2245-4551.7.002
Ana C. Mendes and Ioannis S. Chronakis

Nano-BioScience Research Group, DTU-Food, Technical University of Denmark, B202, 2800Kgs Lyngby, Denmark

Abstract: [+]    |    Download File [ 862KB ]    |   Read Article Online

Abstract: Functional phospholipid nano-microfibers and nano-microparticles developed using electrohydrodynamic processing methods are reviewed. Depending on the phospholipid concentration the solvent used and the processing conditions, fibers and particles with a range of morphologies, mechanical properties and functionalities were observed. The efficacy of electrospun phospholipid fibers as antioxidant, encapsulation, and delivery matrices for bioactive compounds is also presented.

Keywords: Phospholipids, Electrospray, Electrospinning, Nanomechanics, Drug Delivery.

Dynamic Modulation of Plasmonic Structures

doi: https://doi.org/10.13052/jsame2245-4551.7.001
Hans Dyrnesli1, Gunnar Klös1, Matteo Miola2and Duncan S. Sutherland1

1iNANO Center, University of Aarhus, Aarhus 8000, Denmark
2Carbon Dioxide Activation Center (CADIAC), iNANO Center, University of Aarhus, Aarhus 8000, Denmark

Abstract: [+]    |    Download File [ 688KB ]    |   Read Article Online

Abstract: A method for active switching of plasmonic structures by surface oxidestabilized silver deposition is presented. The longitudinal dipole mode in pairs of closely spaced gold nanodisks on ITO was switched by depositing and removing a connecting layer of silver in solution. Optical properties were studied using VIS-NIR extinction spectroscopy and confirmed by FDTD simulations. Uniform dimensional growth by selective silver deposition brought pairs of gold nanodisks of 73 nm average diameter and 11 nm average distance into electrical contact. The growth process was studied by spectroelectrochemical measurements, and uniformity and selectivity were confirmed by SEM and XPS analysis, respectively. Uniform deposition was achieved by introduction of surface oxides on immobilized gold nanodisks, and selectivity by undervoltage deposition. Deposition of silver on disk pairs caused a blue-shift of the transverse dipole mode resonance of roughly 50 nm, and emergence of a new longitudinal mode with resonance around 960 nm. These results demonstrate the possibility for not only tuning of resonance peak position, but also on-demand switching of an additional mode which can provide materials with switchable optical properties.

Keywords: Nanofabrication, active plasmonics, silver electrodeposition, gold nanoparticles, hole-mask colloidal lithography.

River Publishers: Journal of Self-Assembly and Molecular Electronics